Question 27Electricity & Electronics - Assistant Engineer

The correct answer is D) series wound. Series wound DC motors have extremely high starting torque, which makes them well-suited for applications that require high torque at startup, such as cranes and hoists. This high starting torque is due to the series connection of the field winding and the armature winding, which creates a strong magnetic field and high current flow. However, series wound motors have poor inherent speed regulation, meaning their speed can vary significantly with changes in load. This is because the field current is directly proportional to the armature current, and changes in load affect the armature current, leading to speed fluctuations. The other options are incorrect because: A) compound wound motors have a combination of series and shunt windings, which provides better speed regulation than series wound motors; B) permanent magnet motors do not have field windings, and their speed regulation is determined by the strength of the permanent magnets; and C) shunt wound motors have better speed regulation than series wound motors due to the shunt field winding.